“Cuz” is an abbreviation for “Because” which is the appropriate word to use when you are writing or speaking in a professional area, like a business meeting.
In English, the subject comes before the predicate.
We would say:
“The dog is black.”
Not:
“Black is the dog.”
In this sentence, “The dog” is the subject, and “is black” is the predicate.

Use any media that you like to learn more about vocabs and how they are applied in sentences. For instance, if you like to watch movies, then try to pay attention on the words you don’t understand, them analyse the sentence. Try to find its meaning